Bottom of the news cycle
I have gotten a lot better at realizing when it is time to take a break from the news earlier.
I used to have to be in a state of three-alarm aggravation before it'd occur to me to unplug for a while, and my anger didn't always feel manageable. It was affecting my actual world view, pushing me toward simplistic thinking and increasing my sense of isolation.
It has taken a few cycles over the past few years, but I've begun to recognize the early signs, before the emotions around it all get to be more strong than I'd like: I start feeling passing irritation over little things about news sources.
The answer to it all is consistent: Prune back the sources, stick to a single daily summary newsletter for a period, let a sense of equanimity return.